Interconnectable Optical Smoke Alarm with Long-Life Back-up Battery
KF20LL

Mains-powered optical smoke alarm that can be interlinked with up to 23 other Kidde mains alarms, be they ionisation, optical or heat.

Once interlinked, the detection of the relevant danger by an individual unit will sound across all the connected alarms.

Optical alarms are for use in escape or circulation routes and in areas where there is a danger of ignition of furniture and surroundings by cigarettes producing slow, smouldering fires.

This mains-powered unit should be installed by a qualified electrician and can be used throughout the home, except in the kitchen where a Firex Heat Alarm is recommended. These alarms comply with UK Building Regulations for new housing and associated standards (Grade D BS 5839, Part 6).

Interlink with up to 23 Firex hard-wired alarms – all alarms sound if danger is detected

Alarm memory – identifies source unit within interconnecting network

Combined Test/Hush button allows regular testing of alarm function and can be used to temporarily silence nuisance alarms,/li>

Auto reset after activation

Tamper-resistant locking device – prevents unauthorised removal without the use of a tool

Mains operation – 9V Lithium back-up battery supplied as standard

Model KF20LL

Power Supply 230V mains-powered with 9V Alkailine battery back-up

Temperature Range 0ºC to + 40ºC

Humidity Range Up to 93% Relative Humidity (RH) non-condensing

Storage and Transport -20ºC to +60ºC and 5–95% relative humidity (RH) non-condensing

Alarm Dimensions 127 x 127 x 39mm

Bracket Dimensions 133 x 133 x 6mm

Alarm Weight 242g

Warranty 6 years

Approvals BSI certified to BS EN14604:2005

CE tested and certified Sensor Optical, circular lateral chamber with insect-resistant width slot entry portals and added bug screen mesh

Chamber Size 35mm outside diameter x 16mm depth approximate (external)

Detection Band Infrared light wavelength

Button Test Simulates the effect of smoke within the sensing chamber, checks electronics and sounder

Automatic Self-test Circuitry is tested and unit beeps (chirps) if fault is detected

Supply Voltage 230V AC, 50 Hz (nominal UK voltage)

Power Consumption < 15mA

Connection Push-in/snap-fit type connector with 150mm long flying leads (supplied)

Battery Back-up User-replaceable alkaline 9V battery (522/6LR61)

Power-on Indicator Continuous green LED

Alarm Sounder Electronic piezo-electric sounder (T3 pattern sound - 3 pulses - space - 3 pulses), soldered contacts

Sound Output 85dB (A) minimum at 3 metres

Alarm Frequency 3.2 kHz typical

Dust Protection In-built foam gasket in rear of alarm to prevent dust ingress into rear of the alarm

Alarm Status Red LED flashes approx once every five minutes = normal operation

Red LED flashes once a second = sensing smoke (sounder alarm sounds)

Red LED flashes once every ten seconds = in hush condition (auto-reset after 15 minutes)

Interconnection Up to 24 Firex and Kidde ‘Slick’ units (smoke, heat and CO) can be hardwire interconnected with optional control (see below)

Optional Controls Wired Remote Test and Hush Unit (REMTH) allows test and hush of interlinked units

Optional Pattresses SMK23RU also has integral switchable relay for operating remote devices

SMK4896 – Surface mounting base for added ease of installation

Fixing Mounting bracket ring supplied with two ‘T’ slot fitting option

57mm spacing to a maximum of 90mm for standard screw fittings on back boxes

Bracket has 50mm diameter central access hole for cabling

Plastics used NORYL – Cover, main body and mounting bracket

Lead-Free Status All Firex alarms are lead-free

KF20LL User Guide

KF20LL Data Sheet